First Build Underway

whitey said:
I just decided to fork out the 200 big ones. Bit of a bite into my budget. I won my engine on ebay today. My winning Bid was $68 with the free shipping. I couldn't be more happy.
Click to expand...

What engine did you get for $68? A Honda Clone? New?.... If so that seems cheap... did you wait and bid on one rather then "Buy it now" price? I saved a fair bit of money on my chinagirls by doing that on EBay.

Where did you get your CVT?
 
I like the idea of these clone engines. maybe i could get a drop loop later & run one.
hey can someone explain CVT ? I gather it's a transmission of some sort - constant velocity trans ? or what? can someone give more details & explanation please for the newbie
how is it setup & how does it work?

& where are the ebay links for the clone engines ? :-)
 
You are right constant velocity trans. Like on a snowmobile.

After engagement and the RPM"S increase, the front pully closes rising the belt and the rear pully opens lowering the belt changing the speed...........Curt
 
Due to the width of the CVT you'll need to offset the engine to the right. Make sure you have all the parts to establish this offset before mounting the engine.
 
If you run a secondary non reduction jackshaft after the CVT you could theoretically run the engine centerline with the frame. I thought about doing this with my build but came to the conclusion that I only needed to offset the engine about 2" to make everything operate as is so I didn't bother. But it could be done.
 
Cobra is right. This is what I did on my last build and it worked like a charm. However you will have to fab a secondary bb or a jackshaft mount. Or you could just eliminate the pedals all together. With 200cc pedals become more of a aesthetic thing rather than a necessity.
 
Lurker hit the nail on the head. I will be running another BB for the pedals. The loop in my frame is too tight for me to be able to move the engine forward to make room for the pedals. I don't know how wide the engine and CVT will be, but I am sure that I will need to offset it.

Did offsetting the engine produce any problems cobra?

I understand that pedals aren't needed, especially as they won't make the bike any less illegal. But I am would prefer them for the aesthetics


Oh I also thought that CVT stood for Constant Variable Transmission???
 
There is another way. Use a centrifugal clutch and mount the engine centerline. You do without the CVT, though, and it's transmission effect, but there are other benefits to centering the engine. The pedal crank does not have to be so far offset to the right for one. It can be evenly spaced on both sides of the bike.
 
I really like your design Lurker, especially as you were able to center the engine. I don't know if it will suit my design yet. I like the idea of having a pedal side and engine side chain. Aesthetics are the main thing I am after, but I can't go past the performance of the CVT. I know that I will have to offset the pedal cranks and I will try to reduce the offset by as much as possible
 
whitey said:
Lurker hit the nail on the head. I will be running another BB for the pedals. The loop in my frame is too tight for me to be able to move the engine forward to make room for the pedals. I don't know how wide the engine and CVT will be, but I am sure that I will need to offset it.

Did offsetting the engine produce any problems cobra?

I understand that pedals aren't needed, especially as they won't make the bike any less illegal. But I am would prefer them for the aesthetics


Oh I also thought that CVT stood for Constant Variable Transmission???
Click to expand...

Any problems? Not really. It works fine. It only is 2" off centerline. In the bicycle and motorcycle shows I've entered my bike in, won trophies, and the hundreds of people commenting on my bike, not one person ever mentioned that the engine is 2" to the right in the frame. It's just not that much to notice. Yes, the CVT is on the left, but the carburetor and intake are on the right to balance it out. It's not symmetrical, but rather asymmetrical and works.

I need my pedals for my moped license plate on the bike. I would need to show an officer that the bike can move under human power, so I'm stuck with the pedals. It looks good with pedals too. I recently put the same chain on the pedal side as the engine side and it looks better. Sportscarpet brought it to my attention that the chain fits. Thanks for that BTW Pat. I have gone up a super steep grade before and have pedaled to assist the engine, but that was like a 19 or 20 degree incline. It was scary steep. I didn't want to stall out. And I didn't go back down the same way Lol.
 
I hope to not need to pedal the bike, but today I put it through its paces. I really abused it, doing small bunny hops ect. The frame was not up to it. The lug (attached to bottom bracket) tore in half. The good thing is that none of the welds failed. Only the small piece of tubing. I will be beefing that area up before attaching the engine
 
harry76 said:
Ive never heard of someone testing a frame by doing small bunnyhops :-)
Click to expand...

Neither have I, to be honest. But, hey, it got him a result. He found the weakest part of the frame. And when he fixes it, it'll be even stronger, right where it might have given out later.

Sounds crazy, and bunnyhops would never have occurred to me, but I can't argue with finding a good way to beef-up a frame. Pretty clever, I suppose.
 
haha nice comments guys. I honestly just wanted to do what ever I could to stress the frame out as much as possible. I am not the greatest welder, so I wanted to know if something would fail. Just allot better to have something fail whilst only going a few mph rather than at top speed. Seeing as everything survived really well (except for one section of small tube) I will feel allot better going around 30mph

Anyway, my engine arrived! it looks fantastic in my opinion, it fills my frame really well. It really looks the part. The only annoying easy to fix problem is that I will have to attach another bottom bracket for the pedals
 
Also pictured my workshop. I am so lucky that I have access to my school's tech building
 

Attachments

  • close engine side frame.jpg
    close engine side frame.jpg
    326.4 KB · Views: 213
  • engine close up.jpg
    engine close up.jpg
    295.6 KB · Views: 192
  • full side engine frame.jpg
    full side engine frame.jpg
    308.4 KB · Views: 216
  • workshop.jpg
    workshop.jpg
    391.7 KB · Views: 183
You can still modify the loop and open it up a bit. Cut the down tube, sleeve it, then add a larger loop. Chalk it up to R&D. You weren't planning on this engine in the first place so change your design as necessary.
 
R&D?

I might change the frame loop, but I kinda like it the way it is. It mainly depends on the CVT and how much space it will take up. I might not even be able to fit a secondary bottom bracket if it sticks out towards the rear too far.
 
You must log in or register to reply here.
Back
Top